When multiple condensates coexist in one system, they can interfere constructively or destructively. This can result in unconventional coherent behavior not present in single-condensate systems [1]}, [2]}, [3]}. We can mention the multiband crossover from the Bardeen-Cooper-Schrieffer (BCS) regime of loosely bound pairs to the bosonic condensate of molecule-like pairs [4]}, [5]}, [6]}, possible fractional vortices [7]}, [8]}, [9]}, chiral solitons [10]}, [3]}, an enhancement of the intertype superconductivity [12]}, the multiband screening of the pair fluctuations [13]}, [14]}, [15]}, [16]} etc. Such phenomena are pronounced when the spatial profiles (spatial scales) of contributing condensates are different. The perception that the physics of systems with multiple condensates must be more complex than the physics of a single condensate is so appealing that there is even a long-discussed idea of a special type of superconductivity for multiband superconductors [17]}, [18]}, [19]}, [20]}.
